基于混凝土植入式模块与数据融合的裂缝修复监测技术

A technique for monitoring the process of repairing crack based on a concrete implantable module and a data fusion algorithm

大量混凝土结构的老化受损使裂缝修复变得十分频繁,尤其是对于一些工程周期较短的加固抢修工程,实时监测修复过程的变化对跟踪确认结构功能恢复具有重要意义。提出一种能实时监测裂缝修复过程的技术,包括基于新型混凝土植入式模块获取监测数据和基于闵可夫斯基距离(下称闵氏距离)数据融合方法评估修复过程。所设计的模块能植入结构体内,依靠嵌入的压电传感阵列,多路径激发并接收探测应力波,将不同修复时间下模块获取的结构信息用于闵氏距离融合,综合表征裂缝修复过程。通过有限元研究揭示探测应力波在裂缝修复界面的传播特性,提出相对能量闵氏距离和相关系数闵氏距离两个数据融合方法评估裂缝修复过程,并用三维数值模型验证了其表征修复材料水化过程的可行性。最后设计了混凝土裂缝修复试验。将提出的植入式模块和两个基于闵氏距离的数据融合方法用于裂缝修复过程监测,验证了该技术的可行性并探讨了对裂缝修复监测的评估方法。

Crack repairing receives increasing attention for aging and damaged concrete structures.Real-time assessment of crack repairing process is of great significance to timely ensure the structural performance recovery condition in construction.An innovative technique for monitoring the process of crack repairing was presented in this work,including a novel concrete implantable module design,a data fusion-based method to evaluate the repairing work.The designed module can be implanted into structures to actuate and receive multi-path stress waves using the embedded piezoceramic sensing elements array.The sampling data in different moments can be fused in the Minkowski distance for a comprehensive reflection of the repairing work.The finite element study reveals the characteristic of stress-wave propagation at the repairing crack interface.Relative energy and correlation coefficient fused by Minkowski distance were proposed to access the crack repair work,respectively;their feasibility to characterize the hydration process of repairing material was demonstrated via a three-dimensional model.Finally,an experimental study was conducted to verify the feasibility of the proposed technique for monitoring the crack repairing process.